Keychain empty after SSD upgrade

Hi everyone,

as the title says I have installed the newest beta version of macOS Sierra on the newly replaced SSD (before I had an HDD on El Capitan). I have done all the configurations (I had forgotten my iCloud security code and reset it through sms verification) but when I have opened Safari I discovered that all my passwords were gone. I have tried to switch it off and on again but nothing changes.

Do you have any suggestions? I don't think it's because of the beta version.